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The bob of a simple pendulum has mass 2g and a charge of 5.0 μ C. It is at rest in a uniform horizontal electric field of intensity 2000 V/m. At equilibrium, the angle that the pendulum makes with the vertical is – (take g = 10 m/s 2 )

1. tan –1 (5.0)
2. tan –1 (0.5)
3. tan –1 (0.2)
4. tan –1 (2.0)

Correct answer: tan –1 (0.5)

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